Inductor



Aug. 8, 1933. A. s. M GREGOR 1,921,687

INDUGTOR Filed March 29, 1933 FQI;

mm: mm

Inventor: Alexandev 8 .Mac Gregor,

b ZMWZZp-V His Attorney.

Patented Aug. 8, 1933 rnnn'oron Alexander S. MacGregor, Scotia, N. Y., assignmtoGeneral Electric Company, a Corporation of New York Application March 29, 1933. Serial No. 663,370

Claims. (01. 175-359) My invention relates to inductors and more particularly to the type of inductors used in radio and carrier current transmitters.

My invention has for one of its objectsto pro- 5 vide an improved inductor structure. which'is simple and economical to manufacture. V

In the past it has been customary to set up a framework for supporting an inductor and then wind the convolutions of the inductor helix upon such framework. One of the difliculties encountered in such inductor structure is that it is difficult properly to form and to wind the helix so that it remains tight and even against the supporting inductor framework. Accordingly, this invention proposes to wind the inductor helix first upon a suitable jig, or form, and then insert within the helix the supporting structure and provide means for exerting a tension upon the inductor helix so as to produce a rigid inductor assembly. A further object of my invention is to provide an improved inductor arrangement for supporting a preformed inductor helix, with means for applying tension to the convolutions of the inductor helix upon assembly of the inductor arrangement.

The novel features which I believe to be characteristic of my invention are set forth with particularity in the appended claims. My invention itself, however, both as to its organization and method of operation, together with further objects and advantages thereof, will be understood better by reference to the following description taken in connection with the accompanying drawing in which Fig. 1 shows a side view of my invention, and Fig. 2 shows an end view thereof.

Referring to Figs. 1 and 2, I have shown therein an inductor assembly comprising a preformed helix 1 of heavy, bare conducting material, which may be either hollow or solid, supported by a plurality of horizontal insulating members 2, 3 arranged in parallel relation within the helix 1 and extending beyond the inductor helix to the vertical supports 5, 6. The extremities of the inductor helix 1 are fastened to the insulating members, and suitable clips (not shown), may be used for tapping or utilizing any desired portion of the helical inductor. Each of the horizontal insulating members 2, 3 has two of its edges provided with grooves or notches 7 for receiving the convolutions of the helical inductor 1. These grooves '7, as shown in Fig. 2, which are located along the two edges of the insulating member may be formed easily and readily by sawing or milling the material. Each of the vertical supporting rods 5, 6 is pro vided with threaded portions 8 and nuts 9 for securing the horizontal bars 2, 3 in position. By adjusting the nuts 9, the distance between the go horizontal members 2, 3 may be varied, thereby providing a means for exerting a tension on the inductor helix 1, and for securing the convolutions of the conductor of the helix in the groove 7 7, thereby producing a rigid inductor helix. The 5,; insulators 10, ll serve as supports for the entire assembly and insulate the vertical supporting rods 5, 6 from the base or surface upon which the assembly rests. V y

In the process of manufacture, the helix is formed before. .the assembly, of the inductor structure by winding the conductor upon a suitable jig or form.;"Ihe horizontal insulating bars or members '2, 3 are preferably of a material which can be sawed or milled readily to pro vide the grooves or indentations 7. The preparation of these bars therefore requires but a few and simple manufacturing operations. The insulating members 2,3 are then inserted within the helix and the extremities of the inductor helix 1- are fastened to one of the insulating bars. It is to be understood, however,

'that each extremity of the helix 1 could be fastened to a difierent one of the insulating members 2, 3. The horizontal bars 2, 3 are then placed upon. the vertical supporting rods 5, 6, and by adjustment of the nuts 9 on the supports, the distance between the horizontal. bars 2, 3 is increased so as to apply a tension to the inductor helix 1. These horizontal bars 2, 3 make contact with the convolutions of the inductor helix at four points as is apparent from Fig. 2, thereby exerting a tension upon the helix to produce a rigid inductor assembly. The adjustment means 8 and 9upon the verti- 95. cal supports 5, 6 also permit the inductor helix 1 to be tightened if any looseness should develo after long periods of use. 7 j

I It is therefore apparent that this arrangement permits the accurate-winding of the in- .0 ductor helix and because of the simplicity of the supporting structure for the inductor helix, the arrangement involves but few manufacturing operations, thereby providing a simple and economical inductor structure and assembly.

parent that the arrangement herein disclosed lQ bars, a member arranged at each extremity. of-

said bars for supporting said bars in spaced relation to each other and in contact with said helical conductor, and adjustable means ar-] ranged on said supporting members for adjusting the distance between said bars whereby tension may be applied to the convolutions of said inductor.

2. An inductor arrangement comprising a helix of heavy bare conducting material, a pair of long rectangular insulating bars arranged in parallel relation within said helix and extending beyond each end thereof, said bars having grooves along the edges thereof adjacent to said helix for receiving the convolutions of said helix, a single adjustable supporting member juxtaposed at each end of said helix for supporting and maintaining said bars in contact with said helix. 7

3. An inductor arrangement comprising a heavy bare conductor helically wound, a pair of rectangular insulating bars having their largest having its extremities fastened to said bars, a

pair of members for supporting said bars in spaced relation to each other and in contact with said helical conductor, and means arranged on said supporting members for adjusting the distance between said bars whereby tension may be applied to the convolutions of said inductor.

4. An inductor comprising a preformed helix of heavy conducting material, a pair of long rectangular insulating bars arranged in "5. An'inductor structure comprising a pair of vertical supports mounted upon insulators, a pair of horizontal flat insulating members extending between said supports, said insulatingin said grooves, the extremities of said helixbeing fastened to one ofsaid insulating members, and means mounted upon each of said vertical supports'for' adjusting the distance between said'horizontal insulating members whereby tension may be applied to said helix for maintaining said arrangement rigid.

' ALEXANDER S. MACGREGOR, 

